Gear doors dropping

[n619pr]

I've had this thing happen a couple of times : at engine shutdown the landing gear doors will drop. They will however go back fine on engine startup, and the gear cycle fines in flight. Hydraulic fluid level is good, no leak, no gear light.
Any idea ? 

[klausnw]

Short answer: one of the check valves are leaking. The best answer is:

www.mikejonesaircraft.com/geardoor.htm

That inner door has all kinds of issues. Eliminate them and the extra complications Piper engineered into the system.

[n619pr]

Thanks ! Yes I'll end up eventually doing it. There's a MUCH cheaper alternative to MJ by the way !